Excavator.



A. G. BANSMBR.

EXGAVATOR.

APPLICATION nun NOV. 8, 1912.

Patented June 10,1913.

' W] T NESSE WW.

ADOLPH G. BANSMER, L BROOKLYN, NEW YORK.

EXCAVA'TOR.

Specification of Letters Patent.

Patented'June 10, 1913.

Application filed November 8, 1912. Serial No. 730,229.

To all whom it may concern:

. Be it known that I, Aoonrrr G. Baxsnnn, a subject of the Emperor ofGermany, and a resident of Brooklyn, in the county of Kings and State ofNew York, have invented certain new and useful Improvements inExcavators, of which the follow ing is a full, clear, and exactspecification.

This invention relates to excavators and its principal object is toprovide improved means for automatically dumping the bucket when it hasbeen raised to the desired level.

Other objects will become apparent in the course of the followingdescription.

The invention will be first fully described with reference to theaccompanying drawings, which form a part of this specification, and thenpointed out in the claims at the end of :the description.

In the drawings, wherein similar numerals of reference indicatecorresponding parts in each of the several views, Figure l is a sideelevation of an excavator embody" ing the invention, showing thescraping and dumping positions in full and dotted lines respectively;Fig. 2 is an enlarged side elevation of the carriage and adjacentportions of the boom and dipper arm to more clearly illustrate the brakefor clamping the car- 0 a'iage to the boom; and Fig. 3 is a crosssection on the line 3-3 of Fig. 2.

The excavator here illustrated as an example of the invention mayconsist of a mastfl, mounted upon a turntable 2, and "secured by guyropes 3 or other suitable braces. A boom 4 is hinged at its lower ,endto the lower end portion of the mast, and the boom is constructed withlongi- :tudinal tracks 5, along its lower and upper edges, for thetravel of the main rollers of the carriage. The boom is preferably madeI-shaped in cross section, as shown best in Fig. 3, and to the upper endof said boom there are secured brackets 6 between which.

across bar 8 is secured to the brackets, and

to the upper end of said cross-bar there is pivoted an arm 9 carrying asheave 10, at

its free end. A cable 11, one end of which ,issecured to a block 12, atthe upper end of the mast, is passed around said pulley 10,

overa sheave 13, on the block, and thence extends down the mast to beconnected with the operating engine (not shown). A seeend cable 14;passes over the sheave -7, and

has one end secured to the lower end of the is journaled a-sheave 7.Beyond the sheave I cross bar 8, that portion of the cable between thecrossbar 8 and pulley 7, being passed around a sheave 15, mounted on abail 16, pivoted to and projecting forward from the front end of thebucket or dipper l7 and a sheave l5 mounted on the cross bar From thesheave 7 the cable 14 passes to a sh ave 18. on the mast and thence-tothe operating engine.

The bucket or scoop 17 is carried by the lower end of a dipper arm 19,and the bottom of the bucket constitutes a door 20, which controls thedischarge of the matcrial taken up by the bucket. Said door is hung uponoverhanging hinges 21, pivoted upon the rear wall of the bucket, andcarries a sliding bolt 20, at its free forward edge adapted to engage akeeper 21, on the bottom of the bucket for holding thedoor n0rmallyclosed. A cable or chain 22 is attached to the bolt at one end and tothe upper portion of the bail 6, at the other end, the intermediateportion of said cable or chain being passed over a sheave 29.. Thelength of the cable or chain is such as to allow the bolt to engage thekeeper when the bucket is in its lowered position for scraping, and torelease the bolt from said keeper when the bucket is raised to thedesired elevation by reason of the angle between the bail and dipper armbeing increased, as said bucket is raised, whereby the dumping of thecontents of the bucket is accomplished automatically. The upper end ofthe dipper arm 19 is secured to a pivot pin or rock shaft 2, rotatablymounted on the carriage which may consist of side plates 24:, arrangedat opposite sides of the boom and secured to stirrups or hangers 25,extending under the boom and up close to the sides thereof, to furnishbearings for the main supporting rollers or wheels 26, and retainingrollers 27, arranged respectively above and below the tracks 5, as bestillustrated in Fig. 3. The rock shaft or pivot pin 23 projects beyondone or both of the side plates 24 of the carriage and has mountedthereon, so as to turn with the dipper arm, an eccentric or eccentrics30, which bear against the lower end of brake levers 31. Said levers arepivoted intermediate of their ends to the carriage, as at 31', and'attheir upper ends are pivotallyconnected to links 32, which, extenddownwardly and forwardly between the sides of the carriage and the boomand have their lower ends pivoted to and flexible means of connectionextending name to this specification in the presence of between sandlocklng means and arm swulgtwo attestlng wnnesses.

mg means and passed over said sheave for ADOI PH BAN MER automaticallyunlocklng the closure when J S 5 the arm has been raised a predeterminedWitnesses:

distance. FRANK G. QUINN,

In testimony whereof I have signed my J. M. LARSEN.

